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Related Experiment Video

Updated: Feb 12, 2026

Simplified Human Neutrophil Extracellular Traps NETs Isolation and Handling
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Relative antibacterial functions of complement and NETs: NETs trap and complement effectively kills bacteria.

Louiza Azzouz1, Ahmed Cherry2, Magdalena Riedl3

  • 1Cell Biology Program, Research Institute, The Hospital for Sick Children, Toronto, ON, Canada; Department of Biochemistry, University of Toronto, Toronto, ON, Canada.

Molecular Immunology
|March 24, 2018
PubMed
Summary

Neutrophil extracellular traps (NETs) ensnare bacteria but have limited killing ability. Complement is essential for efficient bacterial killing, and NETs can impair complement function.

Keywords:
ComplementNeutrophil extracellular trapsNeutrophilsPseudomonas aeruginosa, Staphylococcus aureus

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Area of Science:

  • Immunology
  • Microbiology

Background:

  • Neutrophil extracellular traps (NETs) are DNA structures with antimicrobial proteins, but their exact function is debated.
  • The interaction between NETs and the complement system in bacterial killing remains unclear.

Purpose of the Study:

  • To elucidate the relative antimicrobial roles of NETs and complement.
  • To investigate how NETs affect complement-mediated bacterial killing.

Main Methods:

  • Primary human neutrophils and serum were used with P. aeruginosa and S. aureus.
  • Colony-counting assays and confocal microscopy were employed.
  • Complement pathways were activated specifically, and NETs were degraded with DNases.

Main Results:

  • NETs trapped most bacteria, but the bacteria remained viable, showing limited bactericidal properties.
  • Complement effectively killed bacteria, but NETs reduced complement's killing ability.
  • Degrading NETs restored complement-mediated killing; classical and lectin pathways were key for killing.

Conclusions:

  • Complement is necessary for efficient bacterial killing, while NETs primarily ensnare bacteria.
  • NETs can impair complement function, highlighting the importance of their degradation for effective immunity.